glsl: Move UsesClipDistance from gl_{vertex,geometry}_program into gl_program.

This will make it easier for back-ends to share code between geometry
shader and vertex shader compilation.  Also, it is renamed to
"UsesClipDistanceOut" to clarify that (a) in geometry shaders, it
refers to the gl_ClipDistance output rather than the gl_ClipDistance
input, and (b) it is irrelevant in fragment shaders.

Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Matt Turner <[email protected]>

2 files changed, 9 insertions, 7 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 2c5ea4b5d2a..97ed1bd6a14 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1965,6 +1965,12 @@ struct gl_program
 
    GLboolean UsesGather; /**< Does this program use gather4 at all? */
 
+   /**
+    * For vertex and geometry shaders, true if the program uses the
+    * gl_ClipDistance output.  Ignored for fragment shaders.
+    */
+   GLboolean UsesClipDistanceOut;
+
 
    /** Named parameters, constants, etc. from program text */
    struct gl_program_parameter_list *Parameters;
@@ -2009,7 +2015,6 @@ struct gl_vertex_program
 {
    struct gl_program Base;   /**< base class */
    GLboolean IsPositionInvariant;
-   GLboolean UsesClipDistance;
 };
 
 
@@ -2023,7 +2028,6 @@ struct gl_geometry_program
    GLenum InputType;  /**< GL_POINTS, GL_LINES, GL_LINES_ADJACENCY_ARB,
                            GL_TRIANGLES, or GL_TRIANGLES_ADJACENCY_ARB */
    GLenum OutputType; /**< GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP */
-   GLboolean UsesClipDistance;
    GLboolean UsesEndPrimitive;
 };
 
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index d3677c8516b..53f0cab7c55 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1855,10 +1855,8 @@ _mesa_copy_linked_program_data(gl_shader_type type,
                                struct gl_program *dst)
 {
    switch (type) {
-   case MESA_SHADER_VERTEX: {
-      struct gl_vertex_program *dst_vp = (struct gl_vertex_program *) dst;
-      dst_vp->UsesClipDistance = src->Vert.UsesClipDistance;
-   }
+   case MESA_SHADER_VERTEX:
+      dst->UsesClipDistanceOut = src->Vert.UsesClipDistance;
       break;
    case MESA_SHADER_GEOMETRY: {
       struct gl_geometry_program *dst_gp = (struct gl_geometry_program *) dst;
@@ -1866,7 +1864,7 @@ _mesa_copy_linked_program_data(gl_shader_type type,
       dst_gp->VerticesOut = src->Geom.VerticesOut;
       dst_gp->InputType = src->Geom.InputType;
       dst_gp->OutputType = src->Geom.OutputType;
-      dst_gp->UsesClipDistance = src->Geom.UsesClipDistance;
+      dst->UsesClipDistanceOut = src->Geom.UsesClipDistance;
       dst_gp->UsesEndPrimitive = src->Geom.UsesEndPrimitive;
    }
       break;